Regular Expressions 101

1st Alternative(^#[0-9A-Fa-f]{6}$)

Group 1(^#[0-9A-Fa-f]{6}$)

^start of line

#the literal # (35₁₀ / 43₈ / 23₁₆)

Character Class[0-9A-Fa-f]{6}

{6}matches exactly 6 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

A-Fone character from A (65₁₀) to F (70₁₀) (case sensitive)

a-fone character from a (97₁₀) to f (102₁₀) (case sensitive)

$end of line

2nd Alternative(^#[0-9A-Fa-f]{3,4}$)

Group 2(^#[0-9A-Fa-f]{3,4}$)

^start of line

#the literal # (35₁₀ / 43₈ / 23₁₆)

Character Class[0-9A-Fa-f]{3,4}

{3,4}matches between 3 and 4 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

A-Fone character from A (65₁₀) to F (70₁₀) (case sensitive)

a-fone character from a (97₁₀) to f (102₁₀) (case sensitive)

$end of line

3rd Alternative(^#[0-9A-Fa-f]{8}$)

Group 3(^#[0-9A-Fa-f]{8}$)

^start of line

#the literal # (35₁₀ / 43₈ / 23₁₆)

Character Class[0-9A-Fa-f]{8}

{8}matches exactly 8 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

A-Fone character from A (65₁₀) to F (70₁₀) (case sensitive)

a-fone character from a (97₁₀) to f (102₁₀) (case sensitive)

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(^#[0-9A-Fa-f]{6}$)|(^#[0-9A-Fa-f]{3,4}$)|(^#[0-9A-Fa-f]{8}$)

New

// good case
#000
#123
#999
#AAA
#aaa
#abc
#FFF
#0000
#9999
#AAAA
#aaaa
#abcd
#FFFF
#ffff
#000000
#456789
#999999
#AAAAAA
#aaaaaa
#abcdef
#FFFFFF
#ffffff
#00000000
#12345678
#99999999
#AAAAAAAA
#aaaaaaaa
#abcdefcc
#FFFFFFFF
#ffffffff
#00123456


//bad case
##
#0
#1
#F
#f
#12
#AB
#ae
#aaaaa
#fffff
#aaaah
#aaaaaaa
#0000000
#ffffhij
#h000000
#aaaaaaai
#000k0123
#asdfasfa

Regular Expression

Extraction